Saint-Sulpice is a Roman Catholic church in Paris on the east side of Place Saint-Sulpice. At 113 metres long, 58 metres in width and 34 metres tall, it is only slightly smaller than Notre-Dame and thus the second largest church in the city. It is dedicated to Sulpitius the Pious. During the 18th century, an elaborate gnomon, the Gnomon of Saint-Sulpice, was constructed in the church.The present church is the second building on the site, erected over a Romanesque church originally constructed during the 13th century. Additions were made over the centuries, up to 1631. The new building was founded in 1646 by parish priest Jean-Jacques Olier who had established the Society of Saint-Sulpice.